By combining InSAR with other land surface datasets including land cover, potential evapotranspiration (a measure of plant water demand), and the location of surface water supply networks, UC San Diego researchers found that between 2015 and 2017, subsidence occurred at much higher rates in irrigated cultivated land compared to undeveloped land, and in dry surface water-limited years relative to wet years. "What's unique here is the incredibly high spatial resolution of the results.

“Our initial hypothesis was that fruit and nut crops would be associated with some of the highest rates of subsidence, but we found the opposite,” said study lead author Morgan Levy, an assistant professor with a joint appointment with UC San Diego’s Scripps Institution of Oceanography and School of Global Policy and Strategy. Subsidence can occur when large amounts of groundwater are removed from underground stores, called aquifers. “We provide a preview of the power of such a synthesis, demonstrating that spatial patterns of subsidence and their relationship to agricultural cultivation and associated water demand are clear and robust.”, They concluded, “Our findings suggest that policy levers supporting sustainable groundwater management might benefit from consideration of the groundwater use intensity of crop selection, not only the difficult-to-define sustainability of groundwater extraction volumes over groundwater aquifer boundaries that remain uncertain and that are costly to delineate.”. Subsidence can occur when large amounts of groundwater are removed from underground stores, called aquifers.

The study, published in the journal Environmental Research Letters, took advantage of the incredibly fine-scale resolution of InSAR to evaluate subsidence patterns according to crop type, revealing surprising results.

Over the study period, there was a median 272 millimeters (or 16 inches) of total cumulative subsidence for field crops (like corn and soy), and a dry water year subsidence rate of 131 millimeters (5 inches) per year. California needs to preserve its groundwater, and it's turning to satellite monitoring to keep tabs on how it's doing.

The research was funded by the National Science Foundation’s Innovations at the Nexus of Food, Energy and Water Systems program, the NASA Earth and Space Science Fellowship and NASA’s support for the NISAR mission science team, as well as the School of Global Policy and Strategy’s Big Pixel Initiative. October 1, 2020 – Researchers at the University of California San Diego report in a new study a way to improve groundwater monitoring by using a …

Researchers at the University of California San Diego report in a new study a way to improve groundwater monitoring by using a remote sensing technology (known as InSAR), in conjunction with climate and land cover data, to bridge gaps in the understanding of sustainable groundwater in California’s San Joaquin Valley. Co-authors include Adrian Borsa, associate professor at Scripps Oceanography, Jennifer Burney, associate professor of environmental science at the School of Global Policy and Strategy, and Wesley Neely, a Ph.D. student at Scripps Oceanography. “The promise of InSAR lies in our ability to combine it with other sources of geophysical and social data to answer water policy-relevant questions,” Levy and co-authors wrote. Subsidence can occur when large amounts of groundwater are removed from underground stores, called aquifers. The UC San Diego research efforts provide an example of how water managers might use satellite data sources, including InSAR, to directly monitor local relationships between subsidence, groundwater pumping and crop portfolios. First, on average fruits and nuts require less water physiologically, compared to field and pasture crops. The data from InSAR can be critical to the state’s efforts to perform effective monitoring and management in response to climate change. The initiative leverages practices in geospatial data visualization, user experience interfaces, and design techniques for scientific discovery and policy decision-making. Methods and findings from this research could be used to support the state’s ongoing effort to prevent overdraft of groundwater aquifers.

California is an example of a semi-arid and irrigation-dependent climate for agriculture. October 1, 2020 – Researchers at the University of California San Diego report in a new study a way to improve groundwater monitoring by using a remote sensing technology (known as InSAR), in conjunction with climate and land cover data, to bridge gaps in the understanding of sustainable groundwater in California’s San Joaquin Valley.

NASA’s Gravity Recovery and Climate Experiment (GRACE) satellite mission, launched in 2002, provides the first opportunity to directly measure However, excessive pumping does occur, even in relatively wet years. ", National Science Foundation, 2415 Eisenhower Avenue, Alexandria, Virginia 22314, USA Tel: (703) 292-5111, FIRS: (800) 877-8339 | TDD: (800) 281-8749, National Science Foundation - Where Discoveries Begin, Computer and Information Science and Engineering (CISE), Environmental Research and Education (ERE), International Science and Engineering (OISE), Social, Behavioral and Economic Sciences (SBE), Responsible and Ethical Conduct of Research, Proposal and Award Policies and Procedures Guide (PAPPG), Award Statistics (Budget Internet Info System), National Center for Science and Engineering Statistics (NCSES), Proposal & Award Policies Procedures Guide (PAPPG). “Our findings indicate that in the Central Valley, the costs and benefits of transitions away from field crops and towards fruit and nut crops in recent years are more complex than typically assumed,” Levy added. Second, field and pasture crops tend to use irrigation methods that are less efficient and higher-volume than those used by fruit and nut crops,” Levy said. The study, published in the journal Environmental Research Letters, took advantage of the incredibly fine-scale resolution of InSAR to evaluate subsidence patterns according to crop type, revealing surprising results. The Global Groundwater Information System (GGIS) is an interactive, web-based portal to groundwater-related information and knowledge. Their work could be revolutionary for managing groundwater use in agricultural regions around the world, as groundwater monitoring and management have been notoriously difficult to carry out due to lack of reliable data.

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